Driver killed in Aug. 18 wreck intoxicated, coroner says

A driver who died last month in a one-vehicle rollover above Dubois was impaired by "mixed drug intoxication," officials said this week.

Charles A. Marquardt, 56, of Illinois, died of blunt force head trauma and internal injuries resulting from the accident, which occurred late in the evening Aug. 18 on Horse Creek Road.

His female passenger was treated and released from a local hospital. She was wearing a seatbelt, Fremont County Coroner Mark Stratmoen said, while Marquardt was not. He was ejected from the vehicle during the crash.

Mixed drug intoxication

Marquardt was under the influence of alcohol,

Valium, Adderall and hydrocodone at the time of his death, toxicology testing showed.

The levels of each prescription drug in his system were within therapeutic limits, Stratmoen said, but none of those substances is meant to be used in conjunction with alcohol.

As a result, Stratmoen has determined that mixed-drug intoxication was a contributing factor in the death.

"While individually (the substances) probably wouldn't have been relevant, together they all are relevant in the death," Stratmoen said.